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The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Streaked Shearwater Calonectris leucomelas	NT	breeding	2003	present	A4ii
Black-tailed Gull Larus crassirostris	LC	resident	2003	present	A4i
A4iii Species group - seabirds	n/a	breeding	2003	min 10,000 breeding pairs	A4iii

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2004) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2004. The most recent assessment (2015) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Forest	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Energy production and mining	likely in long term (beyond 4 years)	some of area/population (10-49%)	no or imperceptible deterioration	low
Geological events	past (and unlikely to return) and no longer limiting	some of area/population (10-49%)	no or imperceptible deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Whole area of site (>90%) covered by appropriate conservation designation	A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	Some limited conservation initiatives are in place	medium

Year	Protected Area	Designation	% overlap with IBA
1981	Sanganjima	国指定鳥獣保護区	100
1994	Rikuchu - Kaigan	National Park	100
2013	Sanriku Fukko (reconstruction)	国立公園	100

Habitat1	Habitat detail	% of IBA
Forest		-
Marine Coastal/Supratidal		-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Sanganjima islet (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/sanganjima-islet-iba-japan on 23/11/2024.